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检索条件"任意字段=Conference on Current Developments in Lens Design and Optical Systems Engineering"

共 530 条记录，以下是121-130 订阅

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design of light guide sleeve on hyperspectral imaging system for skin diagnosis 18

Design of light guide sleeve on hyperspectral imaging system...

引用

conference on current developments in lens design and optical engineering XVIII

作者： Yan, Yung-Jhe Chang, Chao-Hsin Huang, Ting-Wei Chiang, Hou-Chi Wu Jeng-Fu Mang Ou-Yang Natl Chiao Tung Univ Inst Elect Control Engn Hsinchu Taiwan Natl Chiao Tung Univ Inst Biomed Engn Hsinchu Taiwan Natl Chiao Tung Univ Dept Elect & Comp Engn Hsinchu Taiwan Natl Chung Shan Inst Sci & Technol Taoyuan Taiwan

ISBN: (纸本)9781510612082;9781510612075

A hyperspectral imaging system is proposed for early study of skin diagnosis. A stable and high hyperspectral image quality is important for analysis. Therefore, a light guide sleeve (LGS) was designed for the embedded on a hyperspectral imaging system. It provides a uniform light source on the object plane with the determined distance. Furthermore, it can shield the ambient light from entering the system and increasing noise. For the purpose of producing a uniform light source, the LGS device was designed in the symmetrical double-layered structure. It has light cut structures to adjust distribution of rays between two layers and has the Lambertian surface in the front-end to promote output uniformity. In the simulation of the design, the uniformity of illuminance was about 91.7%. In the measurement of the actual light guide sleeve, the uniformity of illuminance was about 92.5%.

关键词： Light guide Uniform illumination Hyperspectral Image

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Metrology of freeform optics

Metrology of freeform optics

引用

optical design and Fabrication, Freeform 2017

作者： Blalock, Todd Brunelle, Matt Ferralli, Ian Myer, Brian Optimax Systems Inc. OntarioNY14519 United States

ISBN: (纸本)9781943580316

Freeform optical surfaces are gaining popularity with lens designers and optical system integrators as a method to solve complex optical system design problems. Fortunately advances in optical manufacturing have opened the possibility for designers to realize these complex surfaces. However as manufacturing techniques improves so must the metrology necessary to measure these parts. We will present some current freeform metrology techniques used that include two contact measurement systems, coordinate measurement machine and a high resolution profilometer, as well as a non-contact method-- deflectometry. © OSA 2017.

关键词： optical systems

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Multi-band filter design with less total film thickness for short-wave infrared 18

Multi-band filter design with less total film thickness for ...

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conference on current developments in lens design and optical engineering XVIII

作者： Yan, Yung-Jhe Chien, I-Pen Chen, Po-Han Chen, Sheng-Hui Tsai, Yi-Chun Ou-Yang, Mang Natl Chiao Tung Univ Dept Elect & Comp Engn Hsinchu Taiwan Natl Cent Univ Dept Opt & Photon Taoyuan Taiwan

ISBN: (纸本)9781510612082;9781510612075

A multi-band pass filter array was proposed and designed for short wave infrared applications. The central wavelength of the multi-band pass filters are located about 905 nm, 950 nm, 1055 nm and 1550 nm. In the simulation of an optical interference band pass filter, high spectrum performance (high transmittance ratio between the pass band and stop band) relies on (1) the index gap between the selected high/low-index film materials, with a larger gap correlated to higher performance, and (2) sufficient repeated periods of high/low-index thin-film layers. When determining high and low refractive index materials, spectrum performance was improved by increasing repeated periods. Consequently, the total film thickness increases rapidly. In some cases, a thick total film thickness is difficult to process in practice, especially when incorporating photolithography liftoff. Actually the maximal thickness of the photoresist being able to liftoff will bound the total film thickness of the band pass filter. For the application of the short wave infrared with the wavelength range from 900nm to 1700nm, silicone was chosen as a high refractive index material. Different from other dielectric materials used in the visible range, silicone has a higher absorptance in the visible range opposite to higher transmission in the short wave infrared. In other words, designing band pass filters based on silicone as a high refractive index material film could not obtain a better spectrum performance than conventional high index materials like TiO2 or Ta2O5, but also its material cost would reduce about half compared to the total film thickness with the conventional material TiO2. Through the simulation and several experimental trials, the total film thickness below 4 um was practicable and reasonable. The fabrication of the filters was employed a dual electric gun deposition system with ion assisted deposition after the lithography process. Repeating four times of lithography and deposition p

关键词： optical interference filter Photolithography Bandpass filter Short-wave infrared

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Some methods for determining the limit of potential image quality of optical systems of various complexities using the database 17

Some methods for determining the limit of potential image qu...

引用

conference on current developments in lens design and optical engineering XVII

作者： Bezdidko, S. JSC Krasnogorsky Zavod Krasnogorsk Moscow Region Russia

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

In the article some methods for processing the information contained in a database are offered with the purpose of extraction of the knowledge, the experience and the intuition of the designers, coded in the database. It gives much attention to the methods for determinating limit potential image quality of optical systems of various complexities.

关键词： lens design image quality orthogonal aberrations limiting aberration correction database

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Fundamentals of concentric lens systems synthesis 17

Fundamentals of concentric lens systems synthesis

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conference on current developments in lens design and optical engineering XVII

作者： Ezhova, Kseniia Zverev, Victor Tochilina, Tatiana Tymoshchuk, Irina ITMO Univ 49 Kronverkskiy Prospect St Petersburg 197101 Russia

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

Introduction of coefficients defining the relationship of the radii of curvature of the surfaces of concentric optical systems, allowed the transformation of the obtained analytical relations in a system of two equations with two unknowns. It is shown that the existence of the solution of the system of equations determined by the optical constants of the selected lens material. The results of the analysis of the conditions of the chromatic aberration correction position and the sequence of obtaining of the system equations define the theoretical basis of the engineering method of parametric synthesis of concentric lens systems. Application of the developed method is illustrated by examples of calculation particular systems design build.

关键词： the system of concentric surfaces spherical aberration chromatic aberration of position the aperture diaphragm the primary aberrations

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optical design of athermalised dual field of view zoom lens in long wave infrared (8μm-12μm) spectral band using benefits of paraxial optics 17

Optical design of athermalised dual field of view zoom lens ...

引用

conference on current developments in lens design and optical engineering XVII

作者： Kucukcelebi, Doruk Roketsan TR-06780 Ankara Turkey

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

This paper presents a methodology for designing an athermalised dual field of view zoom lens in long wave infrared (8 mu m - 12 mu m) spectral band by using the benefits of paraxial optics. By using this design methodology the optical designer can develop many types of complex optical systems in a straightforward way. The key feature of this design methodology relies on utilization of paraxial optics for defining the initial positions of the optical elements. The optical design is based on moving a single lens for changing the optical system's FOV thereby reducing the number of moving parts and simplifying the assembly procedure of the system. The optical design begins with optimization process using paraxial optics. Then the optical design using paraxial optics is used as a template for designing the final optical system by lens material selection for compensating the shift in system's focus due to thermal effects and lens thickness tuning.

关键词： Dual FOV optical design paraxial optics athermalization Long Wave Infrared (LWIR)

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Composition variants for mirror high-aperture lens with compact design 17

Composition variants for mirror high-aperture lens with comp...

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conference on current developments in lens design and optical engineering XVII

作者： Ezhova, Kseniia Zverev, Victor Chuhlamov, Anton Burtseva, Anastasiia ITMO Univ 49 Kronverkskiy Prospect St Petersburg 197101 Russia

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

The theoretical basis for the mirror high-aperture optical system synthesis, based on the properties of the reflecting surface accepted as the base having a shape of a paraboloid of rotation are considered in the work design parameters and residual aberrations tables of the few design solutions for considered optical systems are presented. From the analysis of aberration correction of the image formed by the considered optical system, it follows that the angular value image space is limited, primarily, the image surface curvature. To compensate for curvature of the image surface can be applied Smith lens. The additional condition that determines a high aperture ratio of the optical system of the considered lens as a whole was introduced, but it complicates the process of correcting the aberrations of a wide beam of rays. It is shown that the use of afocal Mersenne system with known anaberration properties, allows you to build a series of compact and SLR mirror-lens systems with aplanatic, anastigmatic and plananastigmatic aberration correction formed the image, at the same time the length of the system is about four times smaller than the diameter of its entrance pupil. Importantly, when applying the lens for using in a long wavelength range emission, the requirements for aberration correction image formed by the lens are reduced, and accordingly, manufacturability are increases.

关键词： the reflecting surface afocal system aplanatic correction of aberrations the lens compensator

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optical performance of a PDMS tunable lens with automatically controlled applied stress 17

Optical performance of a PDMS tunable lens with automaticall...

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conference on current developments in lens design and optical engineering XVII

作者： Cruz-Felix, Angel S. Santiago-Alvarado, Agustin Hernandez-Mendez, Arturo Reyes-Perez, Emilio R. Tepichin-Rodriguez, Eduardo Technol Univ Mixteca Inst Phys & Math Carretera Acatlima km 2-5 Mexico City 69000 DF Mexico Natl Inst Astrophys Opt & Elect Dept Opt Mexico City 72840 DF Mexico

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

The advances in the field of adaptive optics and in the fabrication of tunable optical components capable to automatically modify their physical features are of great interest in areas like machine vision, imaging systems, ophthalmology, etc. Such components like tunable lenses are used to reduce the overall size of optical setups like in small camera systems and even to imitate some biological functions made by the human eye. In this direction, in the last years we have been working in the development and fabrication of PDMS-made tunable lenses and in the design of special mechanical mounting systems to manipulate them. A PDMS-made tunable lens was previously designed by us, following the scheme reported by Navarro et al. in 1985, in order to mimic the accommodation process made by the crystalline lens of the human eye. The design included a simulation of the application of radial stress onto the lens and it was shown that the effective focal length was indeed changed. In this work we show the fabrication process of this particular tunable lens and an optimized mechanism that is able to automatically change the curvature of both surfaces of the lens by the application of controlled stress. We also show results of a study and analysis of aberrations performed to the Solid Elastic lens (SEL).

关键词： Tunable lens crystalline lens wavefront aberration function optomechatronic system

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Efficient 3M PBS Enhancing Miniature Projection Optics 17

Efficient 3M PBS Enhancing Miniature Projection Optics

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conference on current developments in lens design and optical engineering XVII

作者： Yun, Zhisheng Nevitt, Timothy Willett, Stephen Mortenson, Dave Le, John McDowell, Erin Kent, Susan Wong, Timothy Beniot, Gilles J. Ouderkirk, Andrew 3M Co Elect Mat Solut Div St Paul MN 55144 USA 3M Co Elect & Energy Grp Lab St Paul MN 55144 USA

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

Over the past decade, 3M has developed a number of mobile projectors, with a goal towards providing the world's smallest, most efficient projection systems. Compact size and efficiency are required characteristics for projection systems used in mobile devices and more lately, in augmented reality systems. In this paper we summarize the main generations of 3M light engine optical designs. We present the optical architectures of four light engines, including the rationale behind the illumination designs and the projection systems. In particular, we describe various configurations relating to the 3M polarizing beam splitter (PBS) which is key to enhanced efficiency of the miniature projection systems.

关键词： Augmented reality (AR) Head Mounted Display Polarizing beam splitter (PBS) Projection system design Pico projector Illumination system design Projection lens

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optical design and tolerancing of a hyperspectral imaging spectrometer 17

Optical design and tolerancing of a hyperspectral imaging sp...

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conference on current developments in lens design and optical engineering XVII

作者： Liu, Chang Straif, Christoph Fluegel-Paul, Thomas Zeitner, Uwe D. Gross, Herbert Friedrich Schiller Univ Jena D-07743 Jena Germany DLR Space Adm D-53227 Bonn Germany Fraunhofer Inst Angew Opt & Feinmech D-07745 Jena Germany

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

A hyperspectral imaging spectrometer covering the wavelength range from 420 nm to 1000 nm is designed for the purpose of monitoring Earth's environmental change. It has an entrance slit length of 24 mu m, f/# of 3, smile and keystone distortion smaller than 20% of the pixel pitch and a spectral resolution of 6.5 nm. We design and review thirteen systems including one Offner system, two Schwarzschild systems and ten TMA systems for such specifications. Freeform surface and aspheric surface are used in some of the systems to achieve the required system parameters. With all system performance being summarized and evaluated, advantages and disadvantages of three different system types are compared. We down select two systems for further fine adjustments and tolerancing analysis. Final systems with superior performance and detailed tolerancing analysis are given at the end.

关键词： spectrometer TMA Schwarzschild tolerancing

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